With a completed Profile the PDP app can track your per diem automatically. Per Diem Plus™ will post an entry in your Android or iOS notification list when you have traveled (in a straight line) greater than 25 miles from your truck home. The notification will ask if you are on a Trip. Simply select “Yes” and PDP will begin tracking your per diem. If you select “No” (I’m not on a Trip) the app will not track your per diem.